How to Fix Gaps Between Laminate Flooring: A Homeowner's Guide

You're walking barefoot across your laminate floor when you spot it—a gap between two planks that definitely wasn't there before. Your heart sinks a little. Did something go wrong during installation? Is your entire floor about to fall apart? Do you need to replace everything?

Take a breath. You're not alone in this.

Gaps between laminate planks are actually one of the most common laminate floor problems Canadian homeowners face—and here's the really good news: they're usually fixable. The gap showing up doesn't mean your flooring is doomed. It means something specific is happening, and once you understand what, you'll know exactly how to handle it.

In this guide, we'll walk you through why laminate flooring gaps appear, what they mean, and exactly how to fix gaps between planks whether you're dealing with a tiny hairline crack or something more noticeable. By the end, you'll have the knowledge to either DIY the repair or know when to call in a professional.

Why Laminate Flooring Develops Gaps

Here's the thing about laminate flooring gaps: they don't just magically appear. There's always a reason. Understanding the cause is half the battle to fixing it—so let's dig into what's really happening underneath your feet.

Humidity Is the #1 Culprit

The most common reason for gaps? Your home's humidity levels are playing tricks on your flooring.

Think about what laminate actually is: it's made from compressed wood particles with a tough melamine wear layer on top. When the humidity in your home changes—even slightly—that wood core absorbs or releases moisture. And when wood absorbs or releases moisture, it expands and contracts.

Here's the Canadian reality: In summer, your air conditioning might keep humidity moderate. But come winter? Your heating system can dry out your home to 20% humidity or lower. That's a dramatic swing. Your planks expand in one season and shrink in another, and over time, those expansion-and-contraction cycles create visible laminate plank separation.

Quick fact: If you live in Canada and use forced-air heating without a humidifier, humidity control is likely your biggest flooring challenge.

Temperature Swings

While less dramatic than humidity, temperature changes do affect laminate. Think of it like any wood product—it naturally moves a bit when it gets warmer or cooler. Rapid temperature swings (like opening a door to the cold outside in winter) can contribute to floor gap causes over time.

Installation Problems

Sometimes the gap isn't a mystery—it's actually a result of how the floor was installed. If the installer:

• Didn't leave proper expansion gaps around the room's perimeter

• Didn't use quality underlayment

• Rushed the job without allowing proper acclimation time

• Installed over an uneven or damaged subfloor

...then gaps are likely to show up sooner rather than later.

Subfloor Issues

A subfloor with dips, high spots, or flexing under weight is like installing laminate on an unstable foundation. The planks rock slightly, stress develops in the locking mechanisms, and before long, you've got gaps between floor planks.

This is especially common in older homes or homes where the subfloor wasn't properly prepared.

Wear on Locking Mechanisms

Laminate uses click-lock or similar locking systems. Over years of normal foot traffic and movement, these mechanisms can weaken slightly. Eventually, planks can separate just enough to create a visible gap.

 

Are Gaps Between Laminate Flooring a Problem?

Here's the honest answer: it depends. Not all laminate floor problems need emergency action. The real concern is the size of the gap and what caused it. Let's break it down by what you're actually dealing with.

Small Gaps

The verdict: Mostly cosmetic.

A tiny gap that's barely visible? This usually isn't a structural problem. It won't let significant moisture through, and it won't compromise your floor's integrity. Many homeowners leave small gaps in flooring alone, especially if they're only noticeable if you're really looking.

That said, if it bothers you aesthetically (and let's be honest, once you notice it, it's hard not to see it), it's super easy to fill. Keep reading—we'll show you how.

Medium Gaps

The verdict: Time to investigate.

These gaps are noticeable and collect dust. They're not an emergency, but they're a red flag that something's off—usually humidity. This is your cue to:

1. Check your home's humidity level (more on that below)

2. Look for any water damage nearby

3. Feel if the planks are stable or rocking

A medium gap is telling you your floor is reacting to something in your environment.

Large Gaps

The verdict: Don't ignore these.

Bigger gaps between floor planks mean something significant is causing movement. Large gaps can allow moisture, dust, and even pests to get underneath your flooring, damaging the subfloor. This is when professional help becomes important.

How to Fix Small Gaps Between Laminate Planks

Got a small gap that's bugging you? The good news: how to fix gaps is actually pretty straightforward. Let's walk through it step by step.

Step 1: Measure and Assess

First, get a ruler and measure exactly how big we're talking. Also notice where the gap is—running along the length of a plank, or across the width? This helps you pick the right repair method.

Step 2: Vacuum Out the Mess

Use a vacuum or a thin brush to clean out dust, dirt, and debris from inside the gap. Don't skip this step—you need a clean surface for your filler to work properly and look good.

Step 3: Pick Your Repair Method

Now it's time to choose. Here are your options based on gap size:

For Tiny Gaps (Under 1/16 Inch): Honestly? You might just leave it. These are usually invisible unless you're specifically looking, and they don't cause problems.

For Small Gaps (1/16 to 1/8 Inch):

This is where laminate gap repair comes in. You have three solid options:

• Laminate-specific caulk — This is the most popular choice. It's flexible (so it moves when your floor expands/contracts), doesn't shrink excessively, and comes in colors that match laminate finishes. You apply it with a caulk gun, smooth it with your finger, and let it cure per the product instructions. This is a professional-looking solution.
  
  

• Laminate wood filler — Some homeowners prefer this for a more seamless look. Make sure whatever you buy is specifically designed for laminate (regular wood filler can crack). Apply it, let it dry, and sand smooth if needed.
  
  

• Repair markers or coloring pencils — For very subtle gaps, these can make the gap practically invisible without actually filling it. These are temporary and won't close the gap, but they're quick and easy.
  
  

Step 4: Apply Your Filler

Take your time here. Apply slowly and carefully, following the product instructions exactly. Most products need the area to be clean and dry. Don't overfill—a thin, even application looks way better than a big glob of filler.

Fixing Larger or Recurring Gaps

Here's where things get a bit more complex. If your gaps are larger than 1/8 inch, or if laminate gaps keep coming back even after you fill them, just applying filler isn't going to solve the real problem. Something is causing the planks to move, and you need to figure out what.

The golden rule: Always address the root cause before attempting any repair.

Investigate Before You Fix

Before you touch a caulk gun, do this detective work:

1. Check Your Home's Humidity

Grab an inexpensive humidity meter (they cost $10–15 at any hardware store). The ideal range for laminate flooring is 30–50% humidity. Is your home outside this range?

• Too dry (below 30%)? This is super common in Canadian homes during winter when heating systems are running. Your planks are shrinking, creating gaps.

• Too humid (above 50%)? Less common in Canada, but it happens. Your planks swell, and gaps may appear as they adjust.

2. Look for Water Damage

Walk around the gap area. Feel the flooring—is it soft or spongy? Do you smell anything musty? If you detect moisture, water damage might be causing the wood core to swell. This is a serious issue that needs addressing.

3. Test for Movement

Walk on the flooring near the gap. Do the planks feel solid and stable, or do they rock slightly? Rocking planks indicate a subfloor problem.

Now, Based on What You Found...

If Humidity Is Your Problem:

Start by stabilizing your home's humidity. Use a humidifier in winter or a dehumidifier in summer. This can take several weeks or even months to fully stabilize, but it's the real fix. Sometimes, once humidity levels stay consistent for a while, laminate plank separation actually closes on its own. If the gap remains after humidity is controlled, then you can safely apply filler.

If the Subfloor Is Flexing or Uneven:

This is where DIY gets risky. A compromised subfloor needs professional support or repair, and attempting to fix it yourself can create bigger problems. Time to call a professional.

If the Planks Are Warped or Locking Mechanisms Are Damaged:

The gap won't close because the planks themselves are damaged. You may need individual planks replaced or professional repair. Filling a gap caused by damaged planks is just cosmetic—it won't solve the underlying issue.

 

Tools You May Need

Depending on your chosen repair method, gather these items:

• Ruler or measuring tape – to measure gap size

• Vacuum or brush – to clean debris

• Laminate caulk or filler – the primary repair material

• Caulk gun – to apply caulk evenly

• Putty knife – to smooth or remove excess filler

• Humidity meter – to check moisture levels

• Damp cloth – to clean up excess material before it dries

Common Mistakes to Avoid

We see homeowners make these same mistakes over and over. Learn from them so you don't waste time and money.

❌ Forcing Planks Together

Your instinct might be to tap the planks together with a mallet. Don't. This can damage the locking mechanisms and actually make the gap worse—or create new gaps elsewhere. Laminate isn't meant to be forced. Let it be.

❌ Grabbing the Wrong Filler

Here's a costly mistake: using generic caulk, silicone, or whatever wood filler was on sale. These can crack, shrink unpredictably, or look completely wrong on laminate. Always—always—use products specifically designed for laminate flooring. Yes, they cost a bit more, but your floor will actually look good.

❌ Filling Gaps Caused by Humidity (Without Fixing Humidity First)

This one's heartbreaking because homeowners do it all the time. You fill the gap beautifully, step back to admire your work, and six months later? The gap's back. Why? Because you never fixed the humidity problem. The gap returns because the planks keep expanding and contracting. Fix the humidity first, then fill.

❌ Using Too Much Filler

More isn't better. A thick blob of caulk looks amateurish and can actually prevent your flooring from expanding and contracting naturally. Use thin, even applications.

❌ Repairing Wet Flooring

If your flooring feels damp to the touch or smells musty, do NOT fill those gaps. You'll trap moisture inside, which can lead to mold and serious damage. Address the moisture first, let everything dry completely, then repair.

 

---

 

How to Prevent Laminate Flooring Gaps

Here's the truth: preventing gaps is infinitely easier than fixing them. If you're installing new laminate or want to protect what you have, these steps matter.

Step 1: Control Your Home's Humidity (This Is Non-Negotiable)

This is hands-down the most important thing you can do. Prevent flooring gaps by keeping your home's humidity between 30–50% year-round.

• In winter: Use a humidifier. Forced-air heating dries out homes fast, especially in Canada. A whole-home humidifier on your furnace is ideal, but even a portable one in main living areas helps.

• In summer: A dehumidifier keeps moisture levels from creeping too high.

An inexpensive humidity meter ($10–15) tells you exactly where you stand. Check it monthly and adjust as needed.

Step 2: Treat Moisture with Respect

Laminate and water don't mix.

• Don't mop with excessive water. Use a dry or barely damp microfiber cloth instead.

• Wipe spills immediately. The longer water sits on laminate, the higher the risk of damage.

• Never use a steam mop. Steam and laminate are enemies.

Step 3: Right Installation Matters (If You're Starting Fresh)

If you're installing new laminate or replacing old flooring, the installation itself prevents future gaps:

• Proper expansion gaps: The installer should leave 1/4 to 1/2 inch gaps around the room's perimeter. These allow the flooring to expand naturally.

• Quality underlayment: This is your moisture barrier and support layer. Don't cheap out here.

• Acclimation time: New flooring should sit in your home for 48 hours before installation so it adjusts to your home's humidity.

• Flat subfloor: The subfloor must be smooth and level. Any dips or high spots lead to problems down the road.

Step 4: Keep Your Thermostat Steady

Extreme temperature swings stress your floor. Keep your thermostat at a consistent temperature year-round. Yes, this costs a bit more in energy bills, but it protects your investment.

Step 5: Invest in Quality Underlayment

If you haven't already, quality underlayment is your first line of defense against moisture from below and provides support that keeps planks stable.

 

---

 

When to Call a Professional

It's time to contact a flooring professional if:

• Your gaps are larger than 1/4 inch and growing

• Gaps between floor planks keep recurring even after humidity control

• You notice water damage or soft spots around the gaps

• Multiple sections of your floor are gapping

• Your flooring is rocking or moving significantly

• The subfloor appears uneven or damaged

• You're unsure whether the flooring can be repaired or needs replacement

A professional can assess whether your flooring can be salvaged or whether replacement makes more financial sense.

 

---

 

Frequently Asked Questions

Why are there gaps in my laminate flooring?

Gaps most commonly appear due to humidity changes, temperature fluctuations, or subfloor issues. Laminate flooring expands and contracts with moisture, and if your home's humidity swings dramatically, gaps can form between planks.

Can small gaps in laminate flooring be fixed?

Yes. Small gaps can be filled with laminate-specific caulk or wood filler. Identify the gap size, clean the area, and apply your chosen filler according to product instructions.

How do you close gaps between laminate planks?

For small gaps, use laminate caulk or filler applied with a caulk gun. For larger gaps, address the underlying cause (usually humidity) first. Forcing planks together can damage the locking mechanisms.

Why do laminate flooring gaps keep coming back?

Recurring gaps usually indicate that humidity levels in your home are unstable. Even if you fill the gaps, they'll reappear if moisture conditions cause the planks to expand and contract. Controlling humidity is the key to preventing recurrence.

When should laminate flooring be replaced?

Consider replacement if gaps are very large, if the planks themselves are warped or damaged, if water damage is present, or if the locking mechanisms are severely compromised. A professional can help you decide whether repair or replacement is the better choice.

Is it normal for laminate flooring to have small gaps?

Minor gaps are quite common, especially in homes with fluctuating humidity. If gaps remain small (under 1/8 inch) and stable, many homeowners consider them normal. However, if they grow or bother you aesthetically, they can be filled.

Can I prevent gaps when my laminate is first installed?

Yes. Proper installation with correct acclimation time, appropriate expansion gaps, and a quality underlayment significantly reduces the risk of laminate floor problems developing later.

 

---

 

Installation Help Services by Secure Flooring

At Secure Flooring, we understand that laminate flooring should look beautiful and last for years. Whether you're dealing with existing gaps or want to ensure your new laminate installation is done right the first time, our installation help services are here for you.

What We Offer

• Professional Installation: Our experienced team installs laminate flooring with proper spacing, subfloor preparation, and acclimation techniques to prevent future gaps.
  
  

• Gap Assessment and Repair: If you're already experiencing gaps, we can assess the cause and recommend the best solution—whether that's environmental control, professional filling, or plank replacement.
  
  

• Humidity and Moisture Evaluation: We help identify whether humidity or moisture issues are affecting your flooring and recommend solutions to stabilize your home's environment.
  
  

• Subfloor Preparation: A quality installation starts with proper subfloor work. We ensure your subfloor is flat, stable, and ready for laminate.
  
  

• Warranty Support: We stand behind our installations and can help with warranty claims if issues arise.
  
  

Browse Our Laminate Flooring Collection

Ready to install new laminate or replace problematic flooring? Explore our full range of quality laminate options at our laminate flooring collection. We carry styles and finishes to match any home décor.

Get in Touch

Whether you have questions about existing gap issues or want to discuss a new installation, contact Secure Flooring today. Our team is ready to help you enjoy beautiful, gap-free laminate flooring.

Final Takeaway:

Gaps between laminate flooring are fixable in most cases, but the right solution depends on the gap size and what's causing it. Small gaps can be filled with laminate caulk, while larger or recurring gaps usually signal humidity or structural issues that need addressing first.

The best approach? Control your home's humidity, maintain your flooring properly, and contact a professional if gaps don't close or keep returning. With the right care, your laminate flooring can look great and stay gap-free for years to come.